<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <style>
    table {
      width: 600px;
      height: 300px;
    } /* 不要做多余的操作 */

    td {
      border: 1px solid #333;
      text-align: center;
    } /* 不要做多余的操作 */

    td:last-child {
      background-color: #add8e6;
    }
  </style>

  <body>
    <table cellspacing="0" cellpadding="0">
      <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
      </tr>
      <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
      </tr>
      <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
      </tr>
    </table>
  </body>
</html>
